I think some of the highest value from HN comes from the comments, and it's much harder to find the "best" ones, since they might be in threads you might not have otherwise read.
Not sure if it's a "premium feature" so to speak, but would be very cool to extend this to comments generally.
Definitely, comments are usually better than the article. I thought of a 'Letters to the Editors' section that shows top comments (https://news.ycombinator.com/bestcomments) and references the parent story, but it might not be as useful without the context.
Maybe 'See Comments' here could load the comments on the same page? In a newspaper like style.
Not sure if it's a "premium feature" so to speak, but would be very cool to extend this to comments generally.